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rtemsbsd: Clear bus DMA memory a byte at a time

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- memset may be optimized for performance and might work
  with device type memory. Clear a byte at a time.
This commit is contained in:
Chris Johns
2021-10-20 13:42:22 +11:00
parent 38f3de6469
commit f94a67a68d
1 changed files with 7 additions and 2 deletions
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9
rtemsbsd/rtems/rtems-kernel-bus-dma.c
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@@ -9,7 +9,7 @@
*/ */
/* /*
* Copyright (c) 2009-2012 embedded brains GmbH. * Copyright (c) 2009-2012 embedded brains GmbH.
* All rights reserved. * All rights reserved.
* *
* embedded brains GmbH * embedded brains GmbH
@@ -258,7 +258,12 @@ bus_dmamem_alloc(bus_dma_tag_t dmat, void** vaddr, int flags,
(*mapp)->buffer_size = dmat->maxsize; (*mapp)->buffer_size = dmat->maxsize;
if ((flags & BUS_DMA_ZERO) != 0) { if ((flags & BUS_DMA_ZERO) != 0) {
memset(*vaddr, 0, dmat->maxsize); unsigned char* mem = *vaddr;
int len = dmat->maxsize;
while (len-- > 0) {
bsp_bus_space_write_1(mem, 0);
mem++;
}
} }
return (0); return (0);